Texas Instruments TPS37043A8OFDDFRQ1

Overview

TPS37043A8OFDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive triple-channel window voltage supervisor with ±0.25% typical threshold accuracy, fixed 10ms reset delay, open-drain active-low outputs, and 3.3V/1.8V/1.0V fixed thresholds (±5%). It monitors critical power rails in ADAS domain controllers and TI AM62x/TDA4-based systems.

For engineers reviewing the TPS37043A8OFDDFRQ1 datasheet, TPS37043A8OFDDFRQ1 pinout, TPS37043A8OFDDFRQ1 application, or TPS37043A8OFDDFRQ1 equivalent, this page delivers verified functional safety (ASIL-A compliant), channel-specific tolerance configuration, SOT-23-8 package layout, and automotive-grade thermal performance data required for ISO 26262 system design.

Technical Context

The TPS37043A8OFDDFRQ1 implements independent per-channel window supervision using internal precision resistor dividers-no external components needed for threshold setting. Each of its three SENSE inputs supports configurable UV/OV detection with asymmetric tolerance programming (3% to 11% typical), and built-in 0.75% typical hysteresis prevents false resets during rail transients.

Its functional block integrates bandgap-referenced comparators, a programmable timing counter for fixed 10ms reset assertion, POR circuitry, and UVLO protection (1.4V typical). All three RESET outputs are open-drain, active-low, and sink up to 5mA, requiring external pull-ups for proper logic-level translation in automotive microcontroller reset interfaces.

Key Specifications

Pinout & Package

TPS37043A8OFDDFRQ1 uses the DDF (8-pin SOT-23) package: 1.6mm × 2.9mm body size, 0.95mm height, lead pitch 0.65mm. Pin 1 is VDD; pins 2–3–5 are SENSE1/2/3; pin 4 is GND; pins 6–7–8 are RESET3/RESET2/RESET1 respectively. Pins 3, 5, 6, and 7 are NC in this triple-channel variant per TI's pin configuration diagrams (Figures 5-3 and Table 5-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS37043A5OFDDFRQ1, the TPS37043A8OFDDFRQ1 offers optimized 1.0V monitoring for LPDDR4/LPDDR5 memory interfaces; compared with TLV809E33DBZRQ1, it delivers integrated triple supervision with ASIL-A documentation and window functionality-eliminating three discrete devices and reducing PCB complexity.

Availability

TPS37043A8OFDDFRQ1 is available at Aetrix Electronics and suitable for Advanced Driver Assistance Systems (ADAS), automotive infotainment systems, and HEV/EV battery management applications requiring stable component supply and full automotive qualification traceability.

Supply support for TPS37043A8OFDDFRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade IC design and functional safety certification.

The TPS3704-Q1 product line was developed specifically for ASIL-A-compliant voltage supervision in automotive domain controllers, targeting TI's own AM62x and TDA4 processor ecosystems while meeting AEC-Q100 Grade 1 requirements.

FAQ

What is the exact threshold voltage and tolerance for each channel of the TPS37043A8OFDDFRQ1?

The TPS37043A8OFDDFRQ1 has three fixed thresholds: SENSE1 = 3.3V ±5%, SENSE2 = 1.8V ±5%, and SENSE3 = 1.0V ±5%. These values are factory-programmed and do not require external resistors. The ±5% tolerance applies across the full operating temperature range (–40°C to +125°C), and typical accuracy is ±0.25% at 25°C. Each channel operates as a window supervisor, detecting both overvoltage and undervoltage conditions relative to its respective threshold.

Does the TPS37043A8OFDDFRQ1 support push-pull or only open-drain outputs?

The TPS37043A8OFDDFRQ1 features open-drain active-low RESET outputs exclusively (RESET1, RESET2, RESET3). Its device nomenclature suffix "O" confirms open-drain topology per TI's naming convention. No push-pull option exists for this specific part number. Each output requires an external pull-up resistor to the appropriate host rail (e.g., VDD or MCU IO voltage) to generate a valid logic-high level during normal operation.

Is the 10ms reset delay of the TPS37043A8OFDDFRQ1 programmable or fixed?

The TPS37043A8OFDDFRQ1 has a fixed 10ms reset delay - it is not user-programmable. This value is factory-set and confirmed in TI's Device Nomenclature table (Table 4-1), where the "D" in the orderable part number maps to 10ms. The delay is guaranteed over temperature and supply voltage (1.7V–6.0V) with ±30% variation, meaning actual release time ranges from 7ms to 13ms under worst-case conditions.

How does the TPS37043A8OFDDFRQ1 achieve ASIL-A compliance?

The TPS37043A8OFDDFRQ1 achieves ASIL-A compliance through TI's development process targeting functional safety applications, including systematic capability up to ASIL D and hardware capability validated to ASIL A per ISO 26262. Documentation supporting system-level integration - such as FMEDA reports and safety manuals - is provided by TI. The device itself includes built-in diagnostics like POR, UVLO, and glitch-immune comparators, but no runtime self-test features are implemented.

Can the TPS37043A8OFDDFRQ1 monitor voltage rails higher than its VDD supply?

Yes, the TPS37043A8OFDDFRQ1 can monitor voltage rails up to 6.0V on its SENSE pins regardless of VDD level (1.7V–6.0V), as specified in Section 6.3 Recommended Operating Conditions. This allows direct monitoring of 5V or 3.3V rails even when VDD is supplied from a lower-voltage auxiliary source (e.g., 1.8V). Input protection clamps limit SENSE pin voltage to VDD + 0.3V maximum, so external series resistors are recommended for rails exceeding VDD by more than 0.3V.